For an insulating material dielectric strength and dielectric loss should be respectively?
For an insulating material dielectric strength and dielectric loss should be respectively
For an insulating material dielectric strength and dielectric loss should be respectively high or low?
For an insulating material dielectric strength and dielectric loss should be respectively high or low
high and low
high and high
When the dielectric strength of the insulating material (e.g. air) separating the static charges is exceeded.
In SI, the unit of dielectric strength is volts per meter (V/m). In U.S. customary units, dielectric strength is often specified in volts per mil. In physics, dielectric strength 2 meanings: Of an insulating material, the maximum electric field that a pure material can withstand under ideal conditions without breaking down. For a specific configuration of dielectric material and electrodes, the minimum applied electric field that results in breakdown.
the dielectric strength of a material is defined as the min electric stree due to which the meterial get ruptured is called dielectric strngth of that material.
A 'dielectric' describes a material that supports an electric field and is generally used to describe an insulating material. Two properties exhibited by a dielectric are its permittivity and its dielectric strength. High values of permittivity (abillity to improve capacitance) are desirable for dielectrics used in capacitors, and high values of dielectric strength (ability to withstand voltages) are desirable for insulators but, unfortunately, the two quantities aren't relatated. So, selecting a dielectric is a matter… Read More
ASTM D149 - 09 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
One field in which this is helpful is in the manufacture of insulating materials. Dielectric strength determines the strongest electric field an insulator can withstand before it fails. For example, if the insulation around a wire melts or breaks, the insulator's dielectric strength is compromised.
No, these are two unrelated properties of a material.
The dielectric strength refers to the maximum working voltage that a material can withstand without breaking down. At breakdown the electric field frees bound electrons turning the material into a conductor.
INSULATION RESISTANCE: The insulation resistance is a measure of the capability of a material to withstand leakage of current under a Vdc potential gradient. DIELECTRIC STRENGTH: The dielectric strength is a measure of the ability of the material to withstand a large field strength without electrical breakdown, and is usually expressed in volts per mil (.001') or volts per cm of dielectric.
According to a few charts I was able to find, the most realistic material with the highest dielectric strength happens to be Mica, with dielectric strength of 118.
Capacitors are named after their dielectrics. So, an 'air capacitor' uses air as its dielectric, a 'mica capacitor' uses mica as its dielectric, and so on. There are lots of different dielectric used to separate the plates of a capacitor, each with different permittivities and dielectric strengths. As the perfect dielectric (i.e. one with both a very high permittivity and a very high dielectric strength) doesn't occur, the choice of dielectric is always a compromise… Read More
A fault between phase and ground. A "fault" occurs as the result of the dielectric strength of an insulating medium fails. For overhead power lines, the insulating medium is typically air. The phase wires are spaced so far away from each other, and so far away from ground. This spacing is based on the "dielectric strength" of air, or how well air acts as an insulator/resists the flow of electricity. If the distance between a… Read More
An Electric field stress depends on the mechanical strength of the materials and the stresses that are generated during their operation. During high voltage applications, the dielectric strength of insulating materials are developed when subjected to high voltages.
This depends on the particular dielectric. Each has a different breakdown strength.
The dielectric strength of vacuum is infinite because there is no molecule in the vacuum.
no A2: Not necessarily. Solid plastics or solid glass or ceramic have high dielectric strength but not good thermal insulation. Closed-cell foam has good thermal insulating properties but not as good a dielectric strength as solid--there are pockets of gas or air in it. The D.S. is not much better than using the same volume of gas, alone.
Generally, increased moisture levels will lower breakdown strength, especially if the dielectric readily absorbs water. Increasing temperature generally decreases breakdown strength of solid dielectrics. The dielectric strength of some materials may increase with temperature within limited temperature ranges. However, dielectric strength eventually begins to decrease at higher temperatures.
dielectric strength is tested by transformer dielectric strength oil testing machine. at first, oil which is to be tested is pour near the two electrode. both the electrode should be dipped in oil . then adjust the distance between the electrode .now start the machine.when a sound came from machine then note down the dielectric strength of the oil.
It is the tensile force experienced by cable insulation Answer I think you mean either 'dielectric strength' or 'dielectric strain', rather than 'dielectric stress'. Dielectric strength is a measure of the maximum electric field a dielectric can withstand before breakdown, expressed in volts per metre. Dielectric strain is a measure of the electric flux density of an electric field, expressed in coulombs per square metre.
Dielectric loss is basically loss caused due to heating of the dielectric but Dielectric breakdown means permanently destruction of the dielectric strength of the dielectric therby losing its property and hence behaving as a somewhat like conductor.
Generally, dielectric breakdown strength decreases with increasing humidity. In air, exact relationships between dielectric strength and humidity are hard to derive, due to the numerous other variables compounding the relationships (e.g. electrode size and shape, air temperature and pressure). Sources: http://www.scienceforums.net/topic/37206-dielectric-strength-of-air/ http://en.wikipedia.org/wiki/Dielectric_strength
Mostly spark plug insulators are made from a substance known as sintered alumina,which is a very hard ceramic material with a high dielectric strength.
When you say BDV you might mean the dielectric strength of transformer oil. A new transformer oil should have at lest a dielectric strength of 39 KV. from a British standard.Transformer oils used are normally tested using ASTM D877-82 with the KV strength tester using 1" electrodes spaced 0.1" apart and the test voltage increased at 3,000 volts/min until it breaks down. The average Kv obtained after 8 trials is considered the Oil dielectric strength… Read More
3 × 10^6 V/m
No electron support, there by giving it a very high dielectric strength.
3KV/mm or 3X10^6 V/M
Mica is dark colored. It also has high dielectric strength
by spark gaps immersed in the oil sample
Which one of the following tests should not be applied routinely to equipment earth continuity insulation resistance polarity dielectric strength?
d. Dialtetric Strength
The main function of transformer oil is insulating and cooling of the transformer. It should have the following properties: High dielectric strength Low viscosity Freedom from inorganic acids, alkali, and corrosive sulfur Resistant to emulsification Freedom from sludging under normal operation Rapid settling of arc products Low pour point High flash point
Size matters little in identifying a good insulator, unless you mean material thickness. The breakdown strength of the insulating material affects how thick the material has to be in order to sustain a specific voltage difference without harm done to any one or thing. The breakdown strength is normally expressed as volts per unit length (aka thickness). I presume you can get the information from a science or engineering handbook or manufacturing datasheet. You need… Read More
when load is applyed on the material if the material is break that point this is called yield strength of material
strength of material refers to the ability of a material to withstand an applied stress without failure.the material"s strength is dependent on its microstructure.Strength is considered in terms of compresive strength, tensile strength, shear strength,namely the limit states of this strength.The term of strength of materials most often refers to various methods of calculating stesses in structural members, such as beams,columns and shafts.
Characteristic Strength is a term used regionally in order to describe the engineering strength of a material. In other words, the Characteristic Strength is the strength of a material (i.e. steel, concrete, etc.) which has been established by a testing and standards body such that, statistically, a defined percentage of material samples, when tested, exhibit strength at or above the characteristic value. This Characteristic Strength is then used by engineers and designers as the material… Read More
'Strength' is not a common thing to measure or talk about in physics, so I think you mean something else. Possibly force, which is measured in Newtons (N) But to answer the question: The only case I know where the term is used is in material science, and material selection in design. It denotes the maximum amount of force per area of material that the material can handle, for instance before it stretches permanently or… Read More
It is not infinite. At some extreme values electron-positron pairs will start forming rapidly what will result current flow. However from practical standpoint vacuum dielectric strength is limited by field emission from electrodes. Best results are about 40MV/m , what is far worse than some good dielectrics can provide.
When you elongate any material through an axis, till some point material tries to adjust without breaking so that resistance by material is tensile strength of the material and vice versa is compression strength.
All circuit breakers try to achieve the same thing: ensure that the rate of increase of dielectric strength exceeds the rate of increase of potential gradient across the gap between the separating contacts. Explained in another way, the rate at which energy is developed by the arc must be exceeded by the rate at which energy is dissipated through heat transfer. This can be achieved in numerous ways: reduction in arc temperature -which reduces vapourization… Read More
What is the difference between the strength of a material and the strength of a member made from that material?
Strength of a material is usually given in terms of yield strength (the stress at which plastic deformation sets in) and ultimate strength (the maximum stress that the material can sustain) before it eventually breaks. On the other hand, it is not meaningful to talk about strength of a member made from that material. for a member of a certain geometry, one calculates stresses operating on it and compares the stresses to the strength. Stresses… Read More
the maximum stress which the material can bear without breaking is called the maximum tensile strength of the material
The flexural strength is the strength of a material in bending where the top surface is tension and the bottom surface compression The compressive strength is the strength of a material in axial compression loading, where the entire area is in compression. Often,the values are close to each other.
the material looses its shape
It is the ultimate strength of a material subjected to tensile loading. In other words, it is the maximum stress developed in a material in a tension test.
Dariush Shirmohammadi-Nouraini has written: 'Conductive barriers: a measure to improve the dielectric strength of air gaps'
'VPM' appears to be some non-standard symbol for 'volts per metre', the correct symbol for which is 'V/m'. For insulators, many tables list their dielectric strengths in kilovolts per metre (kV/m) or even kilovolts per millimetre (kV/mm).
the material is deformed completely
to increase the strength of the material and decrease the weight of the material